If you can’t hear your friends online, or you can’t join or host an Xbox Live multiplayer game, go to Network > Settings in the Xbox app and check NAT type.

If it says Teredo is unable to qualify, your PC is unable to obtain a Teredo IP address.

Teredo is a networking protocol that’s used to establish secure communications between clients and servers, and to facilitate connectivity between devices behind routers that use network address translation (NAT).

Failure to obtain a Teredo IP address can occur when there’s an issue with your Teredo adapter, when a device on your network is blocking the Teredo protocol, or if there’s software installed on your PC that’s disabling Teredo functionality. Without a Teredo IP address, you’ll be unable to use party chat or do multiplayer gaming on Xbox Live.

Note The Teredo IP address is only necessary for Xbox Live party chat and multiplayer features. If your game doesn’t use the Xbox Live service, consult that game’s support site for help on chat and multiplayer issues.

Solutions

Try the following solutions in order. Move on to the next one only if the previous one didn’t resolve the issue.

Solution 1: Make sure you have an Internet connection

On your PC, launch the Xbox app.

Select Settings > Network.

Under Network status, make sure Internet connection says Connected.

If you don’t have an Internet connection, you’ll have to fix that before continuing with any additional troubleshooting.

Solution 2: Uninstall and reinstall the Teredo adapter

To uninstall the Teredo adapter:

Right-click the Start icon, and then select Command Prompt (Admin).

Run the following command from the Admin command prompt:

netsh interface Teredo set state disable

Right-click the Start icon, and then select Device Manager.

Select View > Show Hidden Devices.

Select Network Adapters.

Identify any adapters that contain "Teredo," such as Teredo Tunneling Pseudo-Interface or Microsoft Teredo Tunneling Adapter. Right-click the adapter name, and then select Uninstall.

Solution 3: Check to see if Teredo is disabled in the registry by a program or by a manually configured registry value

Some programs can alter your PC’s network settings with the purpose of disabling IPv6 (Internet Protocol version 6) networking components, which can include the Teredo tunneling adapter. You can determine whether Teredo has been disabled by running the following commands.

Check the iphlpsvc registry path:

Right-click the Start icon, and then select Command Prompt (Admin).

Run the following command from the Admin command prompt:

reg query HKLM\System\CurrentControlSet\Services\iphlpsvc\Teredo

If the output includes the following line, Teredo has been disabled:

Type REG_DWORD 0x4

You can re-enable Teredo by running the following command from the Admin command prompt:

netsh interface Teredo set state type=default

Check the TcpIp6 registry path:

Right-click the Start icon, and then select Command Prompt (Admin).

Run the following command from the Admin command prompt:

reg query HKLM\System\CurrentControlSet\Services\TcpIp6\Parameters

If the output includes the following line, and the value displayed is not 0x0, Teredo may have been disabled:

DisabledComponents REG_DWORD 0x8e

You can re-enable Teredo by running the following command from the Admin command prompt:

While some applications set these registry values to disable Teredo when the application is installed, others set them every time the application starts. If your PC has one of these applications installed, make sure you have the most up-to-date version, or see their support documentation to learn how to enable Teredo tunneling with their software.

For Teredo to function normally, the IP Helper service needs to be set to start automatically and running. To check:

Enter Services in the search field on your toolbar (Cortana).

Select Services from the search results.

Check the Startup Type for the following service to make sure it’s set to the default value:

IP Helper, Startup Type: Automatic

If the service has been altered from its default startup type, you can revert it back to the default value:

In the Services application, double-click on IP Helper.

In the Properties window, select Automatic from the Startup type drop-down list.

Under Service status, click the Start button.

Click on OK to save the changes.

Some applications reconfigure PC settings to try to optimize performance and will disable Windows services in the process, sometimes affecting the IP Helper service. If you use one of these PC optimization applications, make note of any service configuration changes it makes, as you may need to revert those settings to use Xbox Live party chat and multiplayer.

Solution 5: Check to see if the Teredo server name is set to an invalid value

For Teredo to function normally, it needs to use a valid Teredo server name. To check:

Right-click the Start icon, and then select Command Prompt (Admin).

Run the following command from the Admin command prompt:

netsh interface Teredo show state

The default value for the server name parameter on Windows 10 is win10.ipv6.microsoft.com.

If a different value is displayed and Teredo is unable to obtain an IP address, you can revert it back to the default value. Run the following command in the Admin command prompt:

netsh interface Teredo set state servername=default

Solution 6: Check to see if a hosts file entry has been made, blocking connectivity to Teredo servers

Some applications will block your PC from connecting to Teredo servers by adding entries to the hosts file located under C:\WINDOWS\system32\drivers\etc\hosts.

To check to see if Teredo is failing to resolve the server name because of a hosts file entry:

Right-click the Start icon, and then select Command Prompt (Admin).

Run the following command from the Admin command prompt:

netsh interface Teredo show state

If the following text is displayed, you may have a hosts file entry causing issues:

If an entry is found with that server name, delete the entry and then save the hosts file.

Solution 7: Check to see if Teredo connectivity is blocked by the home router when an IPv6 connection is detected

Some home routers will block Teredo connectivity if they detect that an IPv6 connection is present on the WAN interface of the router. For Teredo to function normally, the router needs to be configured to enable Teredo connectivity. If you have one of these home routers, make sure it has the latest firmware, and see the support documentation to determine how to enable Teredo tunneling on the router. For Apple AirPort and FRITZ!box routers, see:

Solution 8: Check to see if Teredo connectivity is blocked when a VPN client is connected, or while a VPN network adapter is installed

Some VPN clients will disable Teredo connectivity while the VPN client is connected, and some VPN clients that install a network adapter that will disable Teredo until the VPN adapter is removed. If you’ve installed a VPN client and Teredo is still disabled even while the VPN client is disconnected, check to see if you have a network adapter named TAP-Windows Adapter V9 installed:

Right-click the Start icon, and then select Device Manager.

Select View > Show Hidden Devices.

Select Network Adapters.

Identify any adapters that have a name like TAP-Windows Adapter V9. Right-click the adapter name, and then select Uninstall.

Note While uninstalling the VPN network adapter should unblock Teredo connectivity, this will also likely cause issues with the VPN client software. If you still require VPN functionality along with Teredo support, refer to the support documentation for the VPN client.